My calendars were working fine until something unknown happened this morning. I restarted the virtual host and now NO calendars are available. The browse page shows no calendars and, when I put in a calendar URL, I get a 404 error.

The calhost/logs folder is showing WARN, -, Exception when connecting to Post Office ( null

The IP addresses and ports are set up correctly. When I look at the Web interface on the post office under the free/busy settings everything looks fine. Calendar names and URLs are correct.

Any ideas?